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Exploration and Evaluation Assets - Detailed information about exploration and evaluation assets (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Disclosure Of Detailed Information About Exploration For And Evaluation Of Mineral Resources [Line Items]    
Beginning balance $ 2,436 $ 2,579
Additions/Acquisitions 38 55
Transfers to property, plant and equipment (223) (194)
Derecognitions and other (1) (3)
Foreign exchange adjustments   (1)
Ending balance 2,250 2,436
North America    
Disclosure Of Detailed Information About Exploration For And Evaluation Of Mineral Resources [Line Items]    
Beginning balance 2,101 2,258
Additions/Acquisitions 30 40
Transfers to property, plant and equipment (73) (194)
Derecognitions and other (1) (3)
Foreign exchange adjustments   0
Ending balance 2,057 2,101
North Sea    
Disclosure Of Detailed Information About Exploration For And Evaluation Of Mineral Resources [Line Items]    
Beginning balance 0 0
Additions/Acquisitions 0 0
Transfers to property, plant and equipment 0 0
Derecognitions and other 0 0
Foreign exchange adjustments   0
Ending balance 0 0
Offshore Africa    
Disclosure Of Detailed Information About Exploration For And Evaluation Of Mineral Resources [Line Items]    
Beginning balance 83 69
Additions/Acquisitions 8 15
Transfers to property, plant and equipment 0 0
Derecognitions and other 0 0
Foreign exchange adjustments   (1)
Ending balance 91 83
Oil Sands Mining and Upgrading    
Disclosure Of Detailed Information About Exploration For And Evaluation Of Mineral Resources [Line Items]    
Beginning balance 252 252
Additions/Acquisitions 0 0
Transfers to property, plant and equipment (150) 0
Derecognitions and other 0 0
Foreign exchange adjustments   0
Ending balance $ 102 $ 252